WWDC is scheduled to take place once again at the Moscone Center and include hundreds of sessions, labs and events for third-party developers who create apps for Apple's mobile and computer operating systems.

For the first time, Apple said it will distribute tickets to the conference through a random drawing. Apple is changing the process to give developers a fairer shot at getting tickets. Last year, the conference sold out in two minutes.

Developers who would like to attend will have to apply for tickets online before 10 a.m. PDT on April 7. Apple will notify users if they were selected in the drawing later that day.

Apple usually kicks off the conference with a keynote address from Chief Executive Tim Cook, during which numerous upcoming software and new products are unveiled.

This year, Apple is expected to unveil iOS 8 for the iPhone and iPad as well as Mac OS X 10.10 for its laptops and computers. There is also speculation that the company may announce MacBook Air laptops with high-resolution Retina displays.